The effect of helium on the microstructural evolution in PCA as studied by dual beam irradiation

Sekimura, Naoto; Kawanishi, Hiroshi; Nodaka, Masayuki; Ishino, Sonoko

doi:10.1016/0022-3115(84)90618-4

Cited by 20 publications

(4 citation statements)

References 10 publications

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“…They observed that the larger the He appm/dpa ratio, the larger the density over the temperature range investigated from 427 to 650 °C. The bubble size in their study was however similar for both dual-beam conditions along with the pre-implanted and single beam irradiation [29], maybe due to the presence of Ti (C,N) precipitates. In addition, they observed an influence of the irradiation temperature on the bubble size, with similar bubble sizes in their lower range of temperatures for both He appm/dpa ratios whereas at elevated temperatures the 75 appm He/dpa yielded larger bubbles than 15 appm He/dpa.…”

Section: Effect Of Helium Appm/dpa Rate On the He Bubble Size And Nummentioning

confidence: 83%

“…In another austenitic alloy (Fe-16.22Ni-14.57Cr-2.37Mo-1.79Mn) [29], which is basically a titanium modified stainless steel 316 alloy, Sekimura et al studied the effects of two different dual-beam implantation rates (15 and 75 He appm/dpa) and compared it to pre-implantation of 20 appm He and irradiation by a 0.4 MeV Al + ions to 50 dpa. They observed that the larger the He appm/dpa ratio, the larger the density over the temperature range investigated from 427 to 650 °C.…”

Section: Effect Of Helium Appm/dpa Rate On the He Bubble Size And Nummentioning

confidence: 99%

“…This effect of temperature may need further investigation since our study was only done at one fixed temperature. This being said, one ought to be careful when comparing results between different materials when the microstructure can be drastically different; for instance Timodified 316 SS (such as studied in [29]) is known to have a large density of small Ti(C,N) precipitates which can definitely alter the nucleation rate of He bubbles and affect their kinetics of growth since they can act as recombination centers for point defects.…”

Section: Effect Of Helium Appm/dpa Rate On the He Bubble Size And Nummentioning

confidence: 99%

See 2 more Smart Citations

Helium bubble nucleation and growth in alloy HT9 through the use of in situ TEM: Sequential he-implantation and heavy-ion irradiation versus dual-beam irradiation

Duemmler

Zheng

Baumier

et al. 2021

Journal of Nuclear Materials

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The formation of He bubbles in Ferritic/Martensitic steel HT9 is investigated through the use of in situ Transmission Electron Microscopy coupled with He implantation and heavy ion irradiation. Of particular interest is the effect of increasing He appm/dpa ratio on the formation and growth of the bubbles, as well as the effect of the sequential order of ion irradiation i.e. Hepre-implantation followed by heavy-ion irradiation versus true dual-beam irradiation. The role of He is discussed.

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Section: Effect Of Helium Appm/dpa Rate On the He Bubble Size And Nummentioning

confidence: 83%

Section: Effect Of Helium Appm/dpa Rate On the He Bubble Size And Nummentioning

confidence: 99%

Section: Effect Of Helium Appm/dpa Rate On the He Bubble Size And Nummentioning

confidence: 99%

See 1 more Smart Citation

Helium bubble nucleation and growth in alloy HT9 through the use of in situ TEM: Sequential he-implantation and heavy-ion irradiation versus dual-beam irradiation

Duemmler

Zheng

Baumier

et al. 2021

Journal of Nuclear Materials

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“…It was shown in Ref. [17] that far fewer cavities were produced in solution-annealed JPCA irradiated to 50 dpa at 750 and 800 K by heavy ions compared with 316 SS. Cavity-denuded regions can be observed near regions of damage peak [18].…”

Section: Introductionmentioning

confidence: 99%

Cavity Swelling of 15-15Ti Steel at High Doses by Ion Irradiation

Liu,

Ma,

Fan

et al. 2024

Materials

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The titanium-stabilized austenitic stainless steel Fe-15Cr-15Ni, which shows enhanced resistance to irradiation swelling compared with more traditional 316Ti, has been selected as a core material for fast reactors. Data on the evolution of irradiation swelling in 15-15Ti steels at very high doses, which cannot be easily achieved by neutron irradiation, are still lacking. In this paper, the swelling behavior of the titanium-modified austenitic stainless steel 15-15Ti was investigated by pre-implantation of He at room temperature followed by Ni-ion irradiation at 580 °C to peak doses of 120, 240 and 400 dpa. Relatively small cavities were observed in the zone of helium implantation, while large cavities appeared in the region near the damage peak. A correction formula for the dpa curve was proposed and applied to samples with large swelling. It was found that the steady-state swelling rate of 15-15Ti remains at ~1%/dpa even at high doses. By comparing the swelling data of the helium-implanted and helium-free regions at same doses, 70 dpa and 122 dpa, the suppression of swelling by excessive helium can be deduced at such doses.

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